Stay organized with collections
Save and categorize content based on your preferences.
java.lang.ref
Interfaces
| Cleanable |
Cleanable represents an object and a cleaning action registered in a Cleaner.
|
Classes
| Cleaner |
Cleaner manages a set of object references and corresponding cleaning actions.
|
| PhantomReference |
Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed.
|
| Reference |
Abstract base class for reference objects.
|
| ReferenceQueue |
Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected.
|
| SoftReference |
Soft reference objects, which are cleared at the discretion of the garbage collector in response to memory demand.
|
| WeakReference |
Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed.
|
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10 UTC."],[],[],null,["# java.lang.ref\n=============\n\nInterfaces\n----------\n\n|----------------------------------------------------------------|-----------------------------------------------------------------------------------|\n| [Cleanable](/reference/kotlin/java/lang/ref/Cleaner.Cleanable) | `Cleanable` represents an object and a cleaning action registered in a `Cleaner`. |\n\nClasses\n-------\n\n|----------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------|\n| [Cleaner](/reference/kotlin/java/lang/ref/Cleaner) | `Cleaner` manages a set of object references and corresponding cleaning actions. |\n| [PhantomReference](/reference/kotlin/java/lang/ref/PhantomReference) | Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed. |\n| [Reference](/reference/kotlin/java/lang/ref/Reference) | Abstract base class for reference objects. |\n| [ReferenceQueue](/reference/kotlin/java/lang/ref/ReferenceQueue) | Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected. |\n| [SoftReference](/reference/kotlin/java/lang/ref/SoftReference) | Soft reference objects, which are cleared at the discretion of the garbage collector in response to memory demand. |\n| [WeakReference](/reference/kotlin/java/lang/ref/WeakReference) | Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed. |"]]
